Copy the expression ___________, please, without any changes.

A．as it is

B．such as it is

C．what it is

D．so it is

( )指嵌入到非衍生合同(简称“主合同”)中的衍生金融工具。

A．内置型衍生工具
B．交易所交易的衍生工具
C．OTC交易的衍生工具
D．其他类衍生工具